CN101260630B - Straw and/ or ryegrass raw material semi-chemical pulp preparation method - Google Patents
Straw and/ or ryegrass raw material semi-chemical pulp preparation method Download PDFInfo
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- CN101260630B CN101260630B CN2008100276641A CN200810027664A CN101260630B CN 101260630 B CN101260630 B CN 101260630B CN 2008100276641 A CN2008100276641 A CN 2008100276641A CN 200810027664 A CN200810027664 A CN 200810027664A CN 101260630 B CN101260630 B CN 101260630B
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Abstract
The invention discloses a semi-chemical pulp preparation method of a straw and/or wheat straw hood raw material, comprising the following steps that: (1) after the straw and/or wheat straw hood raw material is processed by the chemical pre-dipping treatment or is boiled, the straw and/or wheat straw hood raw material is sent to a hydrabrusher to dilute and disperse, the concentration is added with water to adjusted within the range of 2.5 to 4.5 percent, and the straw and/or wheat straw hood raw material is dispersed into even materials; (2) the diluted and dispersed material is sent to a fluffer by a pump to process, the straw and/or wheat straw hood raw material is dispersed and disintegrated to become a fasciculus; (3) the dewatering and concentrating are performed: the paste after dispersed and disintegrated by the fluffer is transported to a dewatering device to dewater and is concentrated to a solution with a concentration ranging from 6 to 10 percent; (4) the pulping is performed: the dewaterd and concentrated pulp is pumped up to a disk grinder to perform the pulping in order to obtain the pulp for papermaking. The preparation method effectively keeps the fiber length, improves the intensity performance of the paper and has low energy consumption.
Description
Technical field
The invention belongs to the pulping and paper-making field, relate to a kind of pulp preparation method, specifically is the semi-chemical pulp preparation method of a kind of straw and/or wheat straw raw material.
Background technology
The raw material of papermaking mainly is a string, comprises lumber fibre and non-wood-fiber.In the abundant country of the forest reserves such as Europe and America, timber is main paper making raw material, and the paper more than 90% is all manufactured paper with pulp out by wood fiber raw material.
In China and some other Asian countries, because timber resource shortage, non-timber resource is the important source material of pulping and paper-making.Straw and wheat straw are the important non-wood papermaking fibrous raw materials of China.There is the liquid waste concentration height in traditional straw and wheat straw chemical pulping, it is big to pollute, and the silicon content height causes defectives such as the alkali recovery stage is difficult in the waste liquid.Therefore, in recent years, straw and the development of wheat straw high yield pulp technology of preparing that yield height, pollution are less, chemicals consumption is few are rapid, wherein mainly comprise the technology of preparing of semi-chemical pulp.Because yield height, pulp strength are good, straw and wheat straw semi-chemical pulp have obtained paying attention to widely, have very big development potentiality.
The existing straw and/or the preparation technology of wheat straw semi-chemical pulp are after getting the raw materials ready, and raw material is handled or boiling through washing and chemical presoaking stain, are transported to disc mill again and carry out the defibrination processing.The defibrination that adopts in the production is handled to have and is formed thick slurry through excessive concentrations (slurry concentration 15～35%) defibrination earlier, and passing through low concentration (slurry concentration 3～4%) defibrination again becomes good slurry, the technology of the paper that is used to manufacture paper with pulp; Also have and only carry out low concentration (slurry concentration 3～4%) defibrination, pulping be used to the to manufacture paper with pulp processing method of paper.Because straw and/or wheat straw semi-chemical pulp fiber are more stiff, and fiber is short and small, heteroproteose cell content height adopts this low concentration defibrination to handle, and fiber has been caused more serious cut-out, makes the pulping average fiber length lower, the strength of paper poor-performing.And adopt the high concentration defibrination to exist the slurry difficulty of transportation, equipment investment is big, shortcomings such as refining energy consumption height.
Summary of the invention
The objective of the invention is to overcome existing preparation technology's shortcoming, provide that a kind of energy consumption is low, the straw that improves the paper strength performance and/or the semi-chemical pulp preparation method of wheat straw raw material.
The objective of the invention is to be achieved through the following technical solutions:
The semi-chemical pulp preparation method of a kind of straw and/or wheat straw raw material is characterized in that comprising the steps:
(1) dilution and dispersion: straw and/or wheat straw raw material are after processing of chemical presoaking stain or boiling, being transported to hydrabrusher dilutes and disperses, add water and regulate concentration to 2.5～4.5% (weight %), and be dispersed into uniform material, the processing time is 20～30 minutes;
(2) discrete and discongest: through dilution and the product pump after disperseing deliver to fluffer and handle, straw and/or wheat straw raw material is discrete and discongest and become fibre bundle, and fluffer executive component rotating speed is 980～1500 rev/mins; Under the shear action that fluffer executive component high speed rotating produces, straw and/or wheat straw raw material be by discrete and discongest and become fibre bundle, and to the damage of fiber seldom;
(3) dehydration concentrates: the slurry through fluffer behind the discrete and size degradation, and be delivered to dehydration equipment and dewater, be concentrated into the concentration of 6～10% (weight %);
(4) making beating is handled: the mashing pump after dehydration concentrates is delivered to the disc mill processing of pulling an oar, disc mill executive component rotating speed is 750～1500 rev/mins, making beating effect through disc mill, fibre bundle is fully dissociated becomes single fiber, and generation fibrillating to a certain degree, the slurry pulping degree becomes for copying the slurry that paper is used between 32～40 ° of SR at this moment.The number average fiber length of handling back paper pulp is 0.72～0.90mm, and weight average fiber length is 0.89～1.29mm, and double weight average fiber length is 1.17～1.78mm.
The present invention compares with prior preparation method, and following advantage is arranged:
(1) under 2.5～4.5% concentration conditions, straw and/or wheat straw raw material disperse and discongest in fluffer becomes fibre bundle, the swollen of fiber suction simultaneously, make fiber become soft, plasticity increases, and isolates the fibrillating of more complete fiber and fiber during for defibrination and has created advantage.
(2) under 6～10% concentration conditions, pull an oar, compare with traditional low concentration (3～4%) making beating, the suffered cutting action of fiber significantly reduces, interfibrous rubbing action strengthens, thereby pulping process act as the master to the work of fiber in order to fibrillating (comprising interior detail fibration and outside fibrillating), can keep fibre length effectively, help improving the strength of paper performance.
(3) preparation method provided by the invention, handle the preparation method who combines owing to adopted the making beating discrete and that discongest under processing and 6～10% concentration conditions under 2.5～4.5% concentration conditions, with carry out low concentration (3～4%) defibrination again behind traditional high concentration (15～35%) defibrination, or only carry out low concentration (3～4%) refining process and compare, can reduce the preparation process energy consumption more than 20%.Simultaneously, owing to effectively kept fibre length, reduced the damage to fiber, the strength of paper performance indications can improve more than 10%.
Description of drawings
Fig. 1 is the flow chart of a kind of specific embodiment of preparation method provided by the invention.
Fig. 2 is the flow chart of the preparation method's provided by the invention another kind of specific embodiment.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is done further concrete description, but the scope of protection of present invention is not limited to the scope that embodiment explains.
Embodiment 1
Embodiment 1 carries out following operation according to the represented device of Fig. 1:
(1) straw raw material through chemical presoaking stain handle or boiling after, deliver to hydrabrusher 1 and dilute and disperse.Here, the concentration of raw material thin up to 3.5% (weight %), and be dispersed into uniform material, the processing time is 20 minutes.
(2) through dilution and the material after disperseing be delivered to fluffer 3 by pump 2 and disperse and discongest processing.Fluffer executive component rotating speed is 1500 rev/mins.Under the shear action that fluffer executive component high speed rotating produces, straw raw material is dispersed and discongests becomes fibre bundle.
(3) slurry after fluffer 3 disperses and discongests is delivered to dehydration equipment 4 and dewaters, and is concentrated into the concentration of 8.4% (weight %).
(4) slurry after the dehydration is stored in the reserve pit 5, be delivered in the reserve pit 7 by pump 6 again, and after the slurry in the reserve pit 7 reaches certain liquid level, the processing of pulling an oar of 8 pairs of slurries of boot disk grinding machine.Disc mill executive component rotating speed is 1500 rev/mins.Through the making beating effect of disc mill, fibre bundle is fully dissociated becomes single fiber, and produces fibrillating to a certain degree, becomes for copying the slurry that paper is used.
After above preparation method's processing, the beating degree of paper pulp is 35 ° of SR, and number average fiber length is 0.78mm, and weight average fiber length is 1.02mm, and double weight average fiber length is 1.37mm.
Embodiment 2
Embodiment 2 carries out following operation according to the represented device of Fig. 1:
(1) wheat straw raw material through chemical presoaking stain handle or boiling after, deliver to hydrabrusher 1 and dilute and disperse.Here, the concentration of raw material thin up to 4.5% (weight %), and be dispersed into uniform material, the processing time is 30 minutes.
(2) through dilution and the material after disperseing be delivered to fluffer 3 by pump 2 and disperse and discongest processing.Fluffer executive component rotating speed is 980 rev/mins.Under the shear action that fluffer executive component high speed rotating produces, wheat straw raw material is dispersed and discongests becomes fibre bundle.
(3) slurry after fluffer 3 disperses and discongests is delivered to dehydration equipment 4 and dewaters, and is concentrated into the concentration of 10% (weight %).
(4) slurry after the dehydration is stored in the reserve pit 5, be delivered in the reserve pit 7 by pump 6 again, and after the slurry in the reserve pit 7 reaches certain liquid level, the processing of pulling an oar of 8 pairs of slurries of boot disk grinding machine.Disc mill executive component rotating speed is 750 rev/mins.Through the making beating effect of disc mill, fibre bundle is fully dissociated becomes single fiber, and produces fibrillating to a certain degree, becomes for copying the slurry that paper is used.
After the processing, the beating degree of paper pulp is 32 ° of SR, and number average fiber length is 0.90mm, and weight average fiber length is 1.29mm, and double weight average fiber length is 1.78mm.
Embodiment 3
Embodiment 3 carries out following operation according to the represented device of Fig. 1:
(1) straw and wheat straw respectively account for half of weight, through chemical presoaking stain handle or boiling after, deliver to hydrabrusher 1 and dilute and disperse.Here, the concentration of raw material thin up to 2.5% (weight %), and be dispersed into uniform material, the processing time is 25 minutes.
(2) through dilution and the material after disperseing be delivered to fluffer 3 by pump 2 and disperse and discongest processing.Fluffer executive component rotating speed is 1500 rev/mins.Under the shear action that fluffer executive component high speed rotating produces, material is dispersed and discongests becomes fibre bundle.
(3) slurry after fluffer 3 disperses and discongests is delivered to dehydration equipment 4 and dewaters, and is concentrated into the concentration of 7% (weight %).
(4) slurry after the dehydration is stored in the reserve pit 5, be delivered in the reserve pit 7 by pump 6 again, and after the slurry in the reserve pit 7 reaches certain liquid level, the processing of pulling an oar of 8 pairs of slurries of boot disk grinding machine.Disc mill executive component rotating speed is 1000 rev/mins.Through the making beating effect of disc mill, fibre bundle is fully dissociated becomes single fiber, and produces fibrillating to a certain degree, becomes for copying the slurry that paper is used.
After the processing, the beating degree of paper pulp is 38 ° of SR, and number average fiber length is 0.80mm, and weight average fiber length is 1.16mm, and double weight average fiber length is 1.64mm.
Embodiment 4
Embodiment 4 operates according to the represented implementation method of Fig. 2.Its operating procedure is with the different of implementation method that Fig. 1 represents: slurry is stored in the reserve pit 5 after dehydration equipment 4 dehydration, directly is pumped into disc mill 8 processing of pulling an oar by pump 6.Concrete steps are as follows:
(1) wheat straw raw material through chemical presoaking stain handle or boiling after, deliver to hydrabrusher 1 and dilute and disperse.Here, the concentration of raw material thin up to 3%, and be dispersed into uniform material, the processing time is 30 minutes.
(2) through dilution and the material after disperseing be delivered to fluffer 3 by pump 2 and disperse and discongest processing.Fluffer executive component rotating speed is 980 rev/mins.Under the shear action that fluffer executive component high speed rotating produces, wheat straw raw material is become fibre bundle by discrete and size degradation.
(3) fibre stuff after fluffer 3 disperses and discongests is delivered to dehydration equipment 4 and dewaters, and is concentrated into 6% concentration.
(4) slurry after the dehydration is stored in the reserve pit 5, is delivered to the processing of pulling an oar of 8 pairs of materials of disc mill by pump 6 again, and disc mill executive component rotating speed is 1000 rev/mins.
After the processing, the beating degree of paper pulp is 40 ° of SR, and number average fiber length is 0.76mm, and weight average fiber length is 0.97mm, and double weight average fiber length is 1.27mm.
Embodiment 5
Embodiment 5 operates according to the represented implementation method of Fig. 2.Concrete steps are as follows:
(1) straw raw material through chemical presoaking stain handle or boiling after, deliver to hydrabrusher 1 and dilute and disperse.Here, the concentration of raw material thin up to 4%, and be dispersed into uniform material, the processing time is 25 minutes.
(2) through dilution and the material after disperseing be delivered to fluffer 3 by pump 2 and disperse and discongest processing.Fluffer executive component rotating speed is 1200 rev/mins.Under the shear action that fluffer executive component high speed rotating produces, straw raw material is become fibre bundle by discrete and size degradation.
(3) fibre stuff after fluffer 3 disperses and discongests is delivered to dehydration equipment 4 and dewaters, and is concentrated into 9% concentration.
(4) slurry after the dehydration is stored in the reserve pit 5, is delivered to the processing of pulling an oar of 8 pairs of materials of disc mill by pump 6 again, and disc mill executive component rotating speed is 750 rev/mins.
After the processing, the beating degree of paper pulp is 39 ° of SR, and number average fiber length is 0.72mm, and weight average fiber length is 0.89mm, and double weight average fiber length is 1.17mm.
Claims (3)
1. the semi-chemical pulp preparation method of straw and/or wheat straw raw material is characterized in that comprising the steps:
(1) dilution and dispersion: straw and/or wheat straw raw material are after processing of chemical presoaking stain or boiling, being transported to hydrabrusher dilutes and disperses, add water and regulate concentration to 2.5～4.5% (weight %), and be dispersed into uniform material, the processing time is 20～30 minutes;
(2) discrete and discongest: through dilution and the product pump after disperseing deliver to fluffer and handle, straw and/or wheat straw raw material is discrete and discongest and become fibre bundle, and fluffer executive component rotating speed is 980～1500 rev/mins;
(3) dehydration concentrates: the slurry after fluffer disperses and discongests, and be delivered to dehydration equipment and dewater, be concentrated into the concentration of 6～10% (weight %);
(4) making beating is handled: the mashing pump after dehydration concentrates is delivered to disc mill processings of pulling an oar, and obtains supplying to copy the slurry that paper is used, and disc mill executive component rotating speed is 750～1500 rev/mins.
2. the semi-chemical pulp preparation method of straw according to claim 1 and/or wheat straw raw material is characterized in that in the step (1) material concentration is adjusted to 3～4% (weight %).
3. the semi-chemical pulp preparation method of straw according to claim 1 and 2 and/or wheat straw raw material is characterized in that in the step (3) the concentration dehydration of slurry is concentrated into 7～9% (weight %).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100276641A CN101260630B (en) | 2008-04-25 | 2008-04-25 | Straw and/ or ryegrass raw material semi-chemical pulp preparation method |
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| CN2008100276641A CN101260630B (en) | 2008-04-25 | 2008-04-25 | Straw and/ or ryegrass raw material semi-chemical pulp preparation method |
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| CN101260630B true CN101260630B (en) | 2010-08-11 |
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| CN103510415B (en) * | 2012-06-20 | 2018-02-16 | 安德里特斯公开股份有限公司 | Method for decomposing fibrous material |
| CN106192504B (en) * | 2016-07-05 | 2017-12-12 | 连云港市申润包装材料有限公司 | A kind of paper magma reverse mould shaping equipment |
| CN107604722A (en) * | 2017-01-20 | 2018-01-19 | 陈晶 | A kind of system of old newsprint high frequency recycled fibre pulp |
| CN108149504B (en) * | 2017-12-22 | 2020-10-13 | 齐鲁工业大学 | Semi-chemical pulp cleaning and pulping process for mixed raw materials of corn straws and wheat straws |
| CN109957981A (en) * | 2017-12-25 | 2019-07-02 | 福建省青山纸业股份有限公司 | A kind of high-strength high stretched paper bag process thoroughly of production |
| CN112695553A (en) * | 2021-01-04 | 2021-04-23 | 光泽县中联再生资源科技有限公司 | Moisture-proof, mildew-proof and corrosion-proof composite paper and preparation method thereof |
| CN113576900B (en) * | 2021-07-09 | 2023-06-27 | 吴悠 | Active composite fiber membrane material for moxibustion partition and manufacturing process thereof |
| CN113969513B (en) * | 2021-10-28 | 2023-07-25 | 北方化学工业股份有限公司 | Method for breaking nitrocellulose |
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